chore(wails): wire embedded assets and build config

Use BundledAssetFileServer so production builds serve the Wails runtime
alongside the embedded frontend dist (including kbsim samples copied at
build time). Verified via wails3 task build.

Co-authored-by: Cursor <cursoragent@cursor.com>

main.go

@@ -18,7 +18,7 @@ func main() {
 		Name:        "sfxkeeb",
 		Description: "Annotate keyboard key presses on a video timeline",
 		Assets: application.AssetOptions{
-			Handler: application.AssetFileServerFS(assets),
+			Handler: application.BundledAssetFileServer(assets),
 			Middleware: func(next http.Handler) http.Handler {
 				return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 					if r.URL.Path == localMediaVideoPath && fileService != nil {